body { margin: 0; font-family: 'Segoe UI', 'PingFang SC', Arial, sans-serif; background: #f4f6fa; }
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #222e3c;
  padding: 0 24px;
  height: 56px;
  color: #fff;
}
.navbar .logo { font-size: 1.4em; font-weight: bold; letter-spacing: 2px; }
.navbar ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}
.navbar li {
  margin: 0 12px;
}
.navbar a {
  color: #fff;
  text-decoration: none;
  font-size: 1em;
  padding: 8px 12px;
  border-radius: 4px;
  transition: background 0.2s;
}
.navbar a:hover, .navbar a.active {
  background: #3a4a5d;
}
@media (max-width: 700px) {
  .navbar { flex-direction: column; align-items: flex-start; height: auto; }
  .navbar ul { flex-direction: column; width: 100%; }
  .navbar li { margin: 6px 0; }
}
.main-content { max-width: 900px; margin: 40px auto; background: #fff; border-radius: 10px; box-shadow: 0 2px 8px #0001; padding: 32px; }
.join-community {
  margin-top: 32px;
  text-align: center;
}
.join-btn {
  background: #2e8bff;
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 1.1em;
  cursor: pointer;
  transition: background 0.2s;
}
.join-btn:hover { background: #1766c2; } 